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ECE :: Digital Electronics

  1. Which of the following can provide a digital signal?

  2. A.
    Slow change in the value of a resister
    B.
    Sine wave
    C.
    Square wave
    D.
    Gradual turning of a potentiometer

  3. If all bubbles are removed, what are the new RAM locations?
    The 8156 of a figure has RAM locations from 2000 H to 20 FFH.

  4. A.
    (8000)H - (83FF)H
    B.
    (80AA)H - (80FF)H
    C.
    (FF00)H - (FFFF)H
    D.
    none of the above

  5. Data are recorded on a 2, 400 ft reel of magnetic tape at a density of 556 characters per inch. If the record length is of 100 characters and 0.75 inch of record gap, the tape utilization factor is

  6. A.
    0.85
    B.
    0.67
    C.
    0.19
    D.
    0.08

  7. Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is

  8. A.
    NMOS
    B.
    CMOS
    C.
    PMOS
    D.
    both NMOS, CMOS

  9. For a particular type of memory the access time and cycle time are 200 ns each. The maximum rate at which data can be accessed by

  10. A.
    2.5 x 106/s
    B.
    5 x 106/s
    C.
    0.2 x l06/s
    D.
    106/s

  11. Which of the following binary product is incorrect?

  12. A.
    1100 x 1010 = 1111000
    B.
    1.01 x 10.1 = 11.001
    C.
    1100110 x 1000 = 1100110000
    D.
    None of the above

  13. Assertion (A): The advantages of totem pole output are fast switching and low power consumption.

    Reason (R): IC packages available are DIP, surface mount and J lead surface mount.

  14. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

  15. In DTL the junction transistor serves as

  16. A.
    inverter
    B.
    buffer amplifier
    C.
    both (a) and (b)
    D.
    none of the above

  17. A 16 x 8 ROM stores these words in its first four locations, as given below. Which of this represents 3 CH in hexadecimal?

  18. A.
    R0 = 1110 0010
    B.
    R1 = 0101 0111
    C.
    R2 = 0011 1100
    D.
    R3 = 1011 1111

  19. Decade counter has 4 flip flops and skips states 10 to 15.

  20. A.
    True
    B.
    False